Analysis of stripline-fed slot-coupled patch antennas with vias for parallel-plate mode suppression

The paper presents an analysis of slot-coupled stripline-fed patch antennas with vias around the slot to minimize the power launched into the parallel-plate mode. A moment-method scattering formulation is invoked to include the effect of vias on the impedance characteristics of the antenna. Coupling between the stripline feed and the ground-plane slot is obtained by invoking reciprocity. Two design examples were fabricated and the measured input impedances verify the accuracy of the analysis. Vias considerably modify the impedance and resonant characteristics of a patch antenna. The radiation efficiency of patch antennas with and without vias is studied and proper location of the vias is shown to drastically reduce power in the parallel-plate mode.

[1]  Shun Lien Chuang,et al.  On slot-coupled microstrip antennas and their applications to CP operation-theory and experiment , 1990 .

[2]  Tzyy-Sheng Horng,et al.  Multiple arbitrary shape via-hole and air-bridge transitions in multilayered structures , 1996, IMS 1996.

[3]  D. M. Pozar,et al.  Analysis of an infinite phased array of aperture coupled microstrip patches , 1989 .

[4]  A. Ittipiboon,et al.  Spectral domain analysis of aperture-coupled microstrip patch antennas , 1992 .

[5]  D. Schaubert,et al.  Analysis of an aperture coupled microstrip antenna , 1986 .

[6]  A circularly polarized slot-coupled microstrip antenna using a parasitically excited slot , 1991, Antennas and Propagation Society Symposium 1991 Digest.

[7]  D. Pozar.  A reciprocity method of analysis for printed slot and slot-coupled microstrip antennas , 1986 .

[8]  R. Hall,et al.  Performance enhancements for aperture coupled microstrip antennas , 1992, IEEE Antennas and Propagation Society International Symposium 1992 Digest.

[9]  Patrice Brachat,et al.  Dual-polarization slot-coupled printed antennas fed by stripline , 1995 .

[10]  L. Shafai,et al.  Characteristics of aperture coupled microstrip antennas with various radiating patches and coupling apertures , 1995 .

[11]  Yahia M. M. Antar,et al.  A modal expansion method of analysis and measurement on aperture-coupled microstrip antenna , 1991 .

[12]  Arun K. Bhattacharyya.  Electromagnetic Fields in Multilayered Structures Theory and Applications , 1993 .

[13]  R. Collin.  Antenna theory , 1969 .

[14]  K. Chang,et al.  Network modeling of an aperture coupling between microstrip line and patch antenna for active array applications , 1988 .